Improvement in hydraulic wheel-presses



G. A. G RAY; Ir.

H ydraulic Wheei-Presses.

l-Ill.

Patented April 29, 1873.

AM PHOTO-L mm GRAPHIC ca ma (awn/m1? FRacESS UNITED STATEs PATENTOEEIcE.

GEORGE A. GRAY, JE,

OF HAMILTON, OHIO.

IMPROVEMENT IN HYDRAULIC WHEEL-PRESSES.

Specification forming part of Letters Patent No. 138,393, dated April29, 1873; application filed August 20, 1872.

To all whom it may concern:

Be it known that I, GEORGE A. GRAY, Jr., of Hamilton, Butler county,State of Ohio, have inventedacertainnewand usefullmprovement inHydrostatic Apparatus for Forcing Wheels on Axles and other Uses, ofwhich the following is a specification:

Nature and Objects of Invention.

My invention consists in the provision in the water-forcing mechanism oftwo plungers of different diameters or areas for the purpose of rapidlycharging by means of the large one and forcing partially, and completingthe work. by the slower but more powerful small plunger.

Description of the Accompanying Drawing.

Figure 1 is a perspective view of a hydrostatic press embodying myinvention. Fig. 2 is a section showing the driving mechanism of the twoplungers. Fig. 3 exhibits in section the lock-up safety-valve.

General Description.

A B exhibit a wheel and axle, respectively, under pressure. 0 is thestationary frame of the machine; D, an adjustable pressure-head, adaptedto suit difierent lengths of axles; E, the forcing-cylinder, and F theplunger of the same. G is an ordinary valve-chamber of a pump, fittedwith the customary supply and discharge valves. In connection with thissingle chamber two plungers, H I, are fitted to operate. They are ofunequal sizes, as shown. The large one, H, is driven by eccentric-rod J,eccentric K, hollow shaft L,and driving-pulley M, and the small oneisdriven by pitman N crank-wrist O, shaft P, and driving-pulley Q, theshaft P passing through the hollow In operation, the belt is firstshifted over to pulley M, and the plunger H being set in motion, thecylinder E is rapidly filled, and

the workis partially accomplished. When 1 the pressure reaches the limitof power of the large plunger the belt is shifted over to the pulley Q,and the small plunger I completes the work by increasing the pressure tothe safety-valve limit.

Claims.

1. In a hydrostatic press, the combination, with a single pump, ofplungers H and I of unequal area, and arranged for independent action,substantially as and for the purpose specified.

2. The combination, in a hydrostatic press, of the plungers H I ofunequal areas, rods J N, crank and eccentric K 0, shafts L P, anddriving-pulleys M Q, connected and operating substantially in the mannerand for the purpose specified.

In testimony of which invention I hereunto set my hand.

G. A. GRAY, JR.

Witnesses OHAs. A. BAUER, W. N. GRAY.

